3.4 Surgical Complications of Diversion Surgery: Ileus, Leak, Dehiscence & Infection

Surgical Complications of Diversion Surgery: Ileus, Leak, Dehiscence & Infection

Quick Summary: Blueprint item 010315 requires the COCN to recognize dehiscence, infection, and ileus. These are not "someone else's problem" — the ostomy nurse is often at the bedside daily, is the person tracking stoma output hour by hour, and is the person whose pouching decisions determine whether effluent contaminates a healing incision.

Postoperative Ileus: Physiologic, Prolonged, or Mechanical

Physiologic ileus is expected after any abdominal operation. Motility returns in a fixed sequence:

Because the colon is last, a colostomy typically passes flatus first at 48–72 hours, while an ileostomy often produces bilious liquid within 24–48 hours. A urostomy drains urine immediately, and mucus strands appear within days as the transposed intestinal segment continues to secrete.

Prolonged postoperative ileus is the failure to pass flatus or stool and intolerance of oral intake beyond about postoperative day 3–5. Findings include abdominal distension, absent or hypoactive bowel sounds, nausea and vomiting, and — critically for the ostomy nurse — an empty pouch.

Management is supportive and mechanistic:

• Correct electrolytes. Hypokalemia and hypomagnesemia both paralyze smooth muscle. Potassium cannot be corrected until magnesium is repleted, because magnesium is a required cofactor for the Na⁺/K⁺-ATPase pump.
• Minimize opioids. Opioid-induced bowel dysfunction is a leading driver. Multimodal analgesia and regional techniques shorten ileus.
• Alvimopan, a peripherally acting mu-opioid receptor antagonist, accelerates return of function after bowel resection and does not cross the blood-brain barrier, so it preserves central analgesia.
• Early ambulation and sham feeding (gum chewing) stimulate the cephalic-vagal reflex.
• Nasogastric decompression is used for vomiting or gross distension, not prophylactically.
• ERAS protocols — early feeding, opioid-sparing analgesia, euvolemia, early mobilization — reduce ileus duration.

Distinguishing Ileus from Mechanical Obstruction

Important: In a patient with a new stoma, "the stoma stopped working" has a surgical differential that runs from the abdomen to the appliance. Check the obvious mechanical causes at the stoma itself — a barrier aperture constricting an edematous stoma, an incarcerated parastomal hernia, stomal stenosis at the fascial ring — before concluding the problem is generalized ileus.

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Anastomotic Leak

Leak most often declares itself on postoperative day 5–7, though it can present earlier or much later. Risk rises with low pelvic anastomoses, emergency surgery, malnutrition, steroids, immunosuppression, smoking, obesity, diabetes, and preoperative radiation.

Presentations range from dramatic to deceptively subtle:

• Fever, tachycardia, and leukocytosis
• New or recurrent ileus after motility had returned — often the earliest sign
• Peritonitis with guarding and rebound
• Purulent or feculent drain output, or feculent drainage from the incision
• New atrial fibrillation — an underappreciated early marker after colorectal surgery
• Failure to progress, or the vague sense that the patient is simply not getting better

Diagnosis is usually CT with contrast; management ranges from percutaneous drainage of a contained collection to reoperation with proximal diversion. A diverting loop ileostomy is frequently created precisely to protect a low anastomosis, which is why so many ostomy patients have a temporary stoma.

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Wound Dehiscence and Evisceration

Dehiscence is separation of the fascial layers of a surgical incision, typically at postoperative day 5–8, when collagen remodeling has not yet restored tensile strength.

The classic warning sign is a sudden gush of salmon-colored serosanguineous drainage from the incision, often reported by the patient as "something gave way" during a cough, retch, or transfer. Evisceration is protrusion of viscera through the separated fascia.

Warning: Emergency management of evisceration is fixed and frequently tested. Cover the exposed viscera with sterile saline-moistened gauze, position the patient supine with knees flexed to reduce abdominal wall tension, keep them NPO, monitor for shock, and notify the surgeon immediately. Do not attempt to reduce the bowel, do not use dry gauze, and do not leave the patient.

Risk factors are largely the same list that impairs healing everywhere: chronic corticosteroids, malnutrition with albumin below 3.0 g/dL, obesity, diabetes with poor glycemic control, smoking, chronic cough or COPD, ascites, emergency surgery, and prior irradiation. Anti-angiogenic agents such as bevacizumab must be held for weeks before elective surgery for exactly this reason.

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Surgical Site Infection

The CDC classification is worth memorizing because it drives both treatment and reporting:

Colorectal procedures carry among the highest SSI rates of any general surgical category, because the operative field is opened to fecal flora. Signs appear around postoperative day 3–7: expanding erythema, warmth, induration, purulent drainage, tenderness, and fever.

Prevention bundles that the WOC nurse should recognize and reinforce include appropriate timing and intraoperative redosing of prophylactic antibiotics, oral antibiotics with mechanical bowel preparation for colorectal surgery, perioperative normothermia, glycemic control, smoking cessation, and skin antisepsis with alcohol-based chlorhexidine.

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The Ostomy Nurse’s Specific Contribution: Isolating Effluent

This is where the specialty adds unique value, and where exam items live.

When a stoma sits close to a midline incision, a drain site, or an open wound, effluent contamination is a modifiable cause of deep infection and mucocutaneous separation. Practical strategies:

• Reposition the pouch outlet away from the incision, and choose a pouch whose drainage tail directs effluent laterally or inferiorly, away from the wound.
• Cut the barrier asymmetrically, or use a smaller wafer, so adhesive does not overlie the incision or the drain.
• Build a physical dam with barrier rings, strip paste, or a moldable seal along the incision-facing edge.
• Use a transparent film or hydrocolloid over the incision as a fluid-proof cover before applying the pouching system, so any leak tracks over an intact surface.
• For a stoma opening into an open wound, apply fistula-isolation technique: seal the stoma into its own pouch and manage the wound separately, with negative pressure wound therapy if ordered.
• Assess and document the mucocutaneous junction daily. Separation adjacent to an infected incision progresses quickly and changes the pouching plan immediately — convexity is contraindicated over an acute separation.

Exam Tip: When an item describes a new stoma with an adjacent draining incision and asks for the priority nursing action, the answer is almost always the one that physically separates effluent from the wound, not the one that adds a topical product. Containment first, then treatment.